CN101142105A - Shift position sensor error detection device - Google Patents

Shift position sensor error detection device Download PDF

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Publication number
CN101142105A
CN101142105A CNA2006800084674A CN200680008467A CN101142105A CN 101142105 A CN101142105 A CN 101142105A CN A2006800084674 A CNA2006800084674 A CN A2006800084674A CN 200680008467 A CN200680008467 A CN 200680008467A CN 101142105 A CN101142105 A CN 101142105A
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CN
China
Prior art keywords
gear
contact
activation signal
position sensor
abnormality detection
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CNA2006800084674A
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Chinese (zh)
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CN101142105B (en
Inventor
水谷美哉
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Toyota Motor Corp
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Toyota Motor Corp
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H61/00Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H59/00Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/02Selector apparatus
    • F16H59/08Range selector apparatus
    • F16H59/10Range selector apparatus comprising levers
    • F16H59/105Range selector apparatus comprising levers consisting of electrical switches or sensors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H61/00Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1208Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures with diagnostic check cycles; Monitoring of failures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H61/00Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1256Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
    • F16H2061/1284Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is a sensor

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Arrangement Or Mounting Of Control Devices For Change-Speed Gearing (AREA)
  • Control Of Transmission Device (AREA)

Abstract

In order to detect failure of a position contact for outputting a contact signal (SMJ), a change of shift patterns (SP1 to SP17) defined by combinations of the contact signals is monitored. If a shift pattern belonging to a plurality of regions over shift positions (SP6, SP10) corresponding to the selection positions is detected during an OFF period of the contact signal (SMJ), a position contact failure is detected. Thus, it is possible to surely detect failure of a position contact in the shift position sensor selecting a shift position by a combination of contact signals from a plurality of position contacts.

Description

The abnormal detector of gear position sensor
Technical field
The present invention relates to the abnormal detector of gear position sensor, relate in particular to the abnormal detector that combination based on the activation signal of a plurality of gears contact detects the gear position sensor of the gear that chaufeur selects.
Background technology
In the vehicle of automatic transmission with hydraulic torque converter was installed, the gear that the operation of automatic transmission with hydraulic torque converter is selected according to the driver's operation of gear detection device was controlled.Particularly, automatic transmission with hydraulic torque converter limits gear range according to gear, and changes transmitting ratio according to the speed of a motor vehicle and throttle opening.
Usually, shifter bar operation by chaufeur is selected a gear among a plurality of gears, described a plurality of gear comprises: the Parking shelves of selecting when Parking or parking (hereinafter, be called " P shelves "), when reversing the reverse gear selected (hereinafter, be called " R shelves "), neutral gear (hereinafter, be called " N shelves ") and the D Drive (being called hereinafter, " D shelves ") selected when advancing of vehicle.
This selection in a plurality of gears discloses a kind of gear position sensor, and wherein a plurality of gear contact configurations become to detect along the position of the mobile lever arm of shifter bar operation (for example, the open No.11-86680 of Japanese Patent).By this gear position sensor, the activation signal that whether contacts with lever arm based on each gear contact of expression detects gear.
In above-mentioned gear position sensor, when having the gear contact fault, because detection that in this case can't the correct execution gear, so must carry out abnormality detection.For example, can detect the validity of combination of the activation signal of a plurality of gears contact that is arranged on the gear position sensor place, wherein when not corresponding any one the original combination that exists of activation signal combination, can detect to unusually.
But, for this abnormality detection structure, as long as activation signal be combined in the gear contact when having fault among the original activation signal combination that exists, just can't detect gear position sensor unusually, this may cause the delay of abnormality detection.In addition, current activation signal combination needs to compare with all possible combination one by one, thereby causes unusual definite work capacity to increase.
Summary of the invention
The objective of the invention is to detect in the gear position sensor that the chaufeur gear selects in combination based on the activation signal of a plurality of gears contact, reliable and carry out the abnormality detection of gear contact effectively.
Abnormal detector according to gear position sensor of the present invention is the abnormal detector of following a kind of gear position sensor, and this gear position sensor has at least three gears, selects to operate movably wipe contact and export a plurality of gears contact of being scheduled to activation signal when contact with described wipe contact according to the gear of chaufeur.In described gear position sensor, described wipe contact has movable scope, and described movable scope has a plurality of gear positions that correspond respectively to described gear and the transitional region between every adjacent two gear positions in described gear positions.Described a plurality of gears contact comprises a plurality of first gear contacts and the second gear contact, each all is arranged to comprise the part of the described transitional region of single described gear positions and its both sides described a plurality of first gear contact, and the described second gear contact is arranged to corresponding to each described gear positions.In described a plurality of first gear contact at least some are located such that the position of adjacent two the first gear contacts in the described first gear contact preset range that overlaps each other.Described gear position sensor is configured to when described activation signal during from the output of the described second gear contact, based on the described gear of selecting from the combine detection of the described activation signal of described a plurality of first gear contacts output.Described abnormal detector comprises: adjacent area determining unit and abnormality detection unit.Described adjacent area determining unit determines whether the combination from the described activation signal of each in the described first and second gear contacts belongs to a plurality of predetermined adjacent regions that described a plurality of gear positions are set in a plurality of zones that limit corresponding to the combination of described activation signal (shift mode SP1-SP17), corresponding to each (any predetermined adjacent regions in the area I-IV).The described activation signal of the described second gear contact remain on non-output state during, by the described gear positions of process, when described activation signal had become the two or more different predetermined adjacent regions of experience in the described predetermined adjacent regions, described abnormality detection unit detected the fault of the described second gear contact.
In the gear position sensor of the target of monitoring as above-mentioned gear position sensor abnormal detector, when the activation signal of the described second gear contact for just often, during relevant activation signal was non-output state, the phenomenon that the combination of the activation signal of each described gear contact becomes by a plurality of predetermined adjacent regions on the gear positions can not occur.Therefore, during remaining on non-output state, the activation signal in the described second gear contact detects when above-mentioned phenomenon occurring, described abnormal detector can detect the unusual of the described second gear contact, especially an open failure (being generally open circuit fault) that the simple validity check of making up by activation signal is difficult to detect.
Preferably, be configured such that, when repeatedly duplicate detection is to the fault of the described second gear contact by described abnormality detection unit, confirm the fault of the described second gear contact according to the abnormal detector of gear position sensor of the present invention.
According to above-mentioned gear position sensor abnormal detector, can prevent the mistake of the fault detection of the described second gear contact.
The gear position sensor abnormal detector of another structure is the abnormal detector of following a kind of gear position sensor according to the present invention, and this gear position sensor has at least three gears, selects to operate movably wipe contact and export a plurality of gears contact of being scheduled to activation signal when contact with described wipe contact according to the gear of chaufeur.In described gear position sensor, described wipe contact has movable scope, and described movable scope has a plurality of gear positions that correspond respectively to described gear and the transitional region between every adjacent two gear positions in described gear positions.Described a plurality of gears contact comprises a plurality of first gear contacts and the second gear contact, each all is arranged to comprise the part of the described transitional region of single described gear positions and its both sides described a plurality of first gear contact, and the described second gear contact is arranged to corresponding to each described gear positions.In described a plurality of first gear contact at least some are located such that the position of adjacent two the first gear contacts in the described first gear contact preset range that overlaps each other.Described gear position sensor is configured to when described activation signal during from the output of the described second gear contact, based on the described gear of selecting from the combine detection of the described activation signal of described a plurality of first gear contacts output.Described abnormal detector comprises: transition detection unit, regional determining unit and the first abnormality detection unit.Described transition detection unit detects first transition (transformation) and second transition (transformation) from described non-output state to described output state of described activation signal from output state to non-output state of the described second gear contact.When described transition detection unit detects described first or second transition, described regional determining unit determines whether the combination of the described activation signal of each in the described first and second gear contacts belongs in a plurality of zones that limit corresponding to the combination of described activation signal (shift mode SP1-SP17), with the adjacent presumptive area of transformation point (edge) of the activation signal of the described second gear contact.Determine the described combination of described activation signal when described regional determining unit and do not belong to any one when zone in the described presumptive area, the described first abnormality detection unit detects the fault of the described first gear contact.
Abnormal detector according to above-mentioned gear position sensor, whether the transformation of the activation signal of the described second gear contact as triggering, is belonged to and the adjacent presumptive area in edge that has experienced the activation signal of transformation with the combination of the activation signal of determining described gear contact.This makes the validity by the combination of determining activation signal just can detect the fault of the described first gear contact.At this moment, only for the described gear positions in described a plurality of zones (shift mode) and some zone, need carry out the comparison process between the combination of the combination of current activation signal and normal activation signal corresponding to its adjacent area.Therefore, can reduce necessary service load of abnormality detection and memory data output.Therefore, execute exception detects processing effectively.
Preferably, the abnormal detector of the gear position sensor of another structure according to the present invention also comprises the second abnormality detection unit.The described a plurality of zones that limit corresponding to the combination of described activation signal comprise a plurality of predetermined adjacent regions that are provided with corresponding to each gear positions in described a plurality of gear positions.Described transition detection unit both detected also detect less than described second transition less than described first transition during, by the described gear positions of process, when described activation signal had become the two or more different predetermined adjacent regions of experience in the described predetermined adjacent regions, the described second abnormality detection unit detected the fault of the described second gear contact.
Abnormal detector according to above-mentioned gear position sensor, when the activation signal of the described second gear contact just often, during relevant activation signal was non-output state, the phenomenon that the combination of the activation signal of described gear contact becomes by a plurality of predetermined adjacent regions on the described gear positions can not occur in described gear position sensor.Like this, during remaining non-output state, the activation signal in the described second gear contact detects when above-mentioned phenomenon occurring, can detect the unusual of the described second gear contact, especially an open failure (being generally open circuit fault) that the simple validity check of making up by activation signal is difficult to detect.Therefore, both can detect the unusual of the described first gear contact, also can detect the unusual of the described second gear contact.
As mentioned above, according to gear position sensor abnormal detector of the present invention, detect the gear position sensor that the chaufeur gear selects based on combination from the activation signal of a plurality of gears contact output, can be reliably and carry out the abnormality detection of gear contact effectively.
Description of drawings
Fig. 1 is the schematic block diagram that illustrates according to the structure of the abnormal detector of the gear position sensor of the embodiment of the invention;
Fig. 2 shows the layout of the contact of gear shown in Fig. 1;
Fig. 3 shows the combination of activation signal of the contact of gear shown in Fig. 1 and the corresponding relation between the gear;
Fig. 4 is the diagram of circuit of first example that the control program of the gear position sensor abnormality detection that the abnormal detector according to the gear position sensor of the embodiment of the invention carries out is shown;
Fig. 5 shows the qualification in zone shown in the diagram of circuit among Fig. 4;
Fig. 6 shows the diagram of circuit shown in Fig. 4 in further detail;
Fig. 7 is the diagram of circuit that shows according to second example of the control program of the gear position sensor abnormality detection of the embodiment of the invention;
Fig. 8 is the diagram of circuit that shows according to the 3rd example of the control program of the gear position sensor abnormality detection of the embodiment of the invention.
The specific embodiment
Hereinafter, with reference to the accompanying drawings embodiments of the invention are described in detail.Hereinafter, identical or corresponding part is assigned identical Reference numeral, and its detailed description no longer repeats in principle.
Fig. 1 is the schematic block diagram that illustrates according to the structure of the abnormal detector of the gear position sensor of the embodiment of the invention.
With reference to figure 1, comprise a plurality of gears contact 110-180 and ECU (electronic control unit) 300 according to the abnormal detector 10 of the gear position sensor of the embodiment of the invention.
ECU 300 is made up of digital computer, it is according to the preset program executable operations that is stored in the internal storage (not shown), the operation of joystick is selected gear and a plurality of gears contact 110-180 is carried out abnormality detection corresponding to chaufeur according to the combination of activation signal SP, the SR of gear contact 110-180, SN, SD, SB, SRV, SFD, SMJ.
Fig. 2 shows the layout of the contact of gear shown in Fig. 1.
With reference to figure 2, gear position sensor 20 is provided with that be configured to can be in response to the rotor 100 that is along the circumferential direction moved by the operation of the shifter bar (not shown) of driver's operation.Rotor 100 comprises the wipe contact 50 that can contact with the gear contact.The shifter bar operation of a plurality of gears contact 110-180 and chaufeur sequentially is arranged on the movable scope 100# of wipe contact 50 relatively.
Gear contact 110 is arranged to corresponding to zone 101.When wipe contact 50 was in the zone 101, gear contact 110 contacted with wipe contact 50, becomes ON.When wipe contact 50 was not in zone 101, gear contact 110 did not contact with wipe contact 50, thereby it is OFF.
Similarly, gear contact 120 is arranged to corresponding to zone 102, and when wipe contact 50 was in the zone 102, gear contact 120 contacted with wipe contact 50, becomes ON.When wipe contact 50 was not in zone 102, gear contact 120 did not contact with wipe contact 50, thereby is OFF.Gear contact 130-150 is located among the regional 103-105 similarly, and becomes ON separately when contacting with wipe contact 50, and becomes OFF when not contacting with wipe contact 50 separately.
Gear contact 180 is arranged to corresponding to regional 108P, 108R, 108N and 108DB, when wipe contact 50 is among 108P, 108R, 108N and the 108DB in any one zone, because it contacts with wipe contact 50, so become ON.Therebetween, if wipe contact 50 in any one zone, does not contact with wipe contact 50 owing to it, so gear contact 180 is OFF in 108P, 108R, 108N and 108DB so.
Zone 108P, 108R, 108N and 108DB are arranged to the gear chosen position corresponding to unshowned shifter bar.Particularly, regional 108P is defined as the wipe contact position 100P of covering corresponding to shifter bar P shelves chosen position.Zone 108R is defined as the wipe contact position 100R of covering corresponding to shifter bar R shelves chosen position.Zone 108N is defined as the wipe contact position 100N of covering corresponding to shifter bar N shelves chosen position.
Similarly, regional 108DB is defined as covering corresponding to the wipe contact position 100D of shifter bar D shelves chosen position with corresponding to the wipe contact position 100B that brakes shelves (being called hereinafter, " B shelves ") chosen position.
Should be noted that the B shelves are the gear that is provided with in the motor vehicle driven by mixed power, when improving the regenerative brake power of electrical motor when need be, select this gear at descending etc.D shelves and B shelves for selecting when vehicle advances are typically provided with wide regional 108DB.
Here, on the movable scope 100# of wipe contact 50, corresponding to wipe contact 50 residing " gear positions " when gear is selected, the zone between the adjacent gear positions is corresponding to " transitional region " separately for regional 108P, 108R, 108N and 108DB.
As shown in Figure 2, regional 101-103 is arranged to comprise regional 108P, 108R and 108N respectively, and is wider than separately regional 108P, 108R and 108N.In addition, the zone that zone 104 and 105 covers comprises regional 108DB, and they are arranged such that adjacent part overlaps each other.
For the detection of the gear that moves forward and backward corresponding to vehicle, gear contact 160 and 170 are set in many ways also.When wipe contact 50 was in the zone 106 of being arranged to overlay area 108R, gear contact 160 contacted with wipe contact 50.When wipe contact 50 was not in zone 106, gear contact 160 did not contact with wipe contact 50.
Similarly, when wipe contact 50 was in the zone 107 of being arranged to overlay area 108DB, gear contact 170 contacted with wipe contact 50.When wipe contact 50 not regional 107 the time, gear contact 170 does not contact with wipe contact 50.
Again with reference to figure 1, contact with wipe contact 50 and when being in ON, each gear contact 110-180 is connected power supply 105 with ECU 300 at each gear contact 110-180, do not contact and when being in OFF, power supply 105 is disconnected from ECU 300 at it with wipe contact 50.Therefore, when corresponding gear contact was ON, each activation signal SP, SR, SN, SD, SB, SRV, SFD and the SMJ of input ECU 300 became " ON ", and when corresponding gear contact was OFF, it became " OFF ".That is to say that for each gear contact 110-180, when corresponding activation signal was " ON ", ECU 300 thought " activation signal is an output state ", and when corresponding activation signal is " OFF ", it thinks " activation signal is non-output state ".
Here, gear contact 110-170 is corresponding to " the first gear contact " of the present invention, and gear contact 180 is corresponding to " the second gear contact " of the present invention.
Fig. 3 shows the combination of activation signal of the contact of gear shown in Fig. 1 and the corresponding relation between the gear.
With reference to figure 3, when each gear contact 110-180 just often, layout according to the gear contact 110-180 shown in Fig. 2, (in P shelves side: (in B shelves side: the rightmost side among Fig. 2), order obtains the shift mode SP1-SP17 that determines corresponding to the activation signal combination leftmost side Fig. 2) to move to end points from the starting point of movable scope 100# along with wipe contact 50.
When wipe contact 50 is in the gear positions, and when the activation signal SMJ of gear contact 180 is " ON " (, in shift mode SP1, SP6, SP10, SP15-SP17 any the time), ECU 300 detects because the gear that driver's operation is selected from a plurality of gears based on the combination of the activation signal of other gear contact 110-170.
Particularly, be " ON " and other activation signal when being the shift mode SP1 of " OFF " when except activation signal SMJ, also having activation signal SP, the P shelves are detected as the gear of selection.When also have activation signal SR and SRV except activation signal SMJ be " ON " and other activation signal when being the shift mode SP6 of " OFF ", and the R shelves are detected as the gear of selection.In addition, when also having activation signal SN except activation signal SMJ for " ON " and other activation signal during for the shift mode SP10 of " OFF ", the P shelves are detected as the gear of selection.
Similarly, be " ON " and other activation signal when being the shift mode SP15 of " OFF " when except activation signal SMJ, also having activation signal SD and SFD, the D shelves are detected as the gear of selection.In addition, when also having activation signal SB and SFD to be the shift mode SP16 of " ON " and SP17 except activation signal SMJ, the B shelves are detected as the gear of selection.
Should be noted that the shift mode SP1-SP17 correspondence shown in Fig. 3 " a plurality of zone " that the combination corresponding to the activation signal of gear contact 110-180 limits.Wherein, corresponding to each shift mode between shift mode SP1, the SP6 of gear positions, SP10, SP15, the SP17 corresponding to " transitional region ".
Like this, when the activation signal SMJ of gear contact 180 is " ON ", carry out the selection of gear.Therefore, need detect the open failure of gear contact 180 reliably, this open failure is owing to opening circuit or other factors makes activation signal SMJ be fixed as " OFF ".
For traditional gear abnormality detection structure, when the combination of activation signal SP, SR, SN, SD, SB, SRV, SFD and SMJ does not correspond among the SP1-SP17 of shift mode shown in Fig. 3 any one, detect the unusual of each gear contact 110-180.But the abnormality detection structure of this validity check based on activation signal combination can produce following point.
As first problem, be difficult to detect the open failure of above-mentioned gear contact 180.For example, suppose that wipe contact 50 is in the zone corresponding to the shift mode SP1 of gear positions.In this case, when the activation signal SMJ of being assumed to be among the shift mode SP1 " ON " when becoming " OFF ", the combination that the combination of activation signal becomes in the situation with shift mode SP2 is identical.Traditional abnormality detection structure can't detect unusual in this case.
Similarly, in other shift mode SP6, SP10 and SP15 corresponding to gear positions, when the activation signal SMJ that is assumed to be " ON " when " OFF ", the combination of activation signal becomes respectively and shift mode SP5,7, SP9,11 identical with the combination of SP14.Therefore, even when wipe contact 50 is in the relevant gear positions, also can't detect the open failure of gear contact 180.Therebetween, when activation signal SMJ became " OFF " among the shift mode SP1, the combination of the activation signal among the shift mode SP17 was different from adjacent shift mode SP16.Therefore, in the time of in wipe contact 50 is in corresponding to the zone of shift mode SP17, can detect the open failure of gear contact 180.In other words, only after chaufeur is selected the B shelves, just can detect unusually, this means that the detectability of gear contact 180 open failure is low.
As second problem, owing to must detect the activation signal combination of expression error state, so, need in the relatively shorter time cycle, carry out the activation signal combination of this time point and the comparison procedure of normal combination for the situation of operating shifter bar in response to chaufeur fast realizes abnormality detection.
In addition,, in above-mentioned comparison procedure, need compare with each normal combination, promptly compare with each shift mode SP1-SP17 in the activation signal combination of this time point as the 3rd problem.Second and the 3rd problem increased the load of the abnormality detection process of 300 pairs of gear contacts of ECU 110-180.
In abnormal detector according to the gear position sensor of the embodiment of the invention, unusual by following gear position sensor abnormality detection control detection gear contact 110-180, the especially open failure of gear contact 180.The program of this gear position sensor abnormality detection control is carried out with predetermined interval according to the program that prestores by ECU 300.
Fig. 4 is the diagram of circuit of first example that the control program of the gear position sensor abnormality detection that the abnormal detector according to the gear position sensor of the embodiment of the invention carries out is shown.
With reference to figure 4, in step S100, ECU 300 determines whether the activation signal SMJ of gear contact 180 is " OFF ".
If activation signal SMJ is " ON " (being defined as NO in step S100), open failure does not appear in gear contact 180 so.Therefore, in step S110, ECU 300 removes various determined values and is initial value.Particularly, the aftermentioned experience flag F L1-FL4 of area I-IV separately is initialized as " OFF ", and the numerical value EN in experience zone and the number of times FN of abnormality detection also are initialized as 0.With beginning operation when carrying out system initialization, also these determined values are set at initial value.
If activation signal SMJ is " OFF " (being defined as YES in step S100), for relevant gear contact 180 open failure are carried out abnormality detection, ECU 300 carries out the following step so.
At first, in step S120, ECU 300 determines whether current shift mode C (SP) belong among the predetermined adjacent area I-IV any one.
With reference to figure 5, adjacent area I-IV is defined as and comprises, in the transitional region that between gear positions, exists, and corresponding to the shift mode of shift mode position adjacent shift mode SP2, SP5, SP7, SP9, SP11 and SP14 (hereinafter, also unified be called " adjacent shift mode ").Particularly, adjacent area I is defined as and comprises that the shift mode SP2 adjacent with shift mode SP1, adjacent area II are defined as and comprise shift mode SP5 and the SP7 adjacent with shift mode SP6.Similarly, adjacent area III is defined as and comprises that shift mode SP9 and the SP11 adjacent with shift mode SP10, adjacent area IV are defined as and comprise the shift mode SP14 adjacent with shift mode SP15.Hereinafter, adjacent area I-IV also is called area I-IV simply.
With reference to figure 4, (be defined as YES in step S120) when current shift mode C (SP) belongs to one of presumptive area I-IV again, that is, when it was adjacent shift mode, in step S130, ECU 300 checked whether shift mode changes.
In step S130, ECU 300 makes comparisons current shift mode C (SP) and the shift mode P (SP) that discovers, the shift mode when this shift mode P (SP) be previous execute exception detection control program.If current shift mode C (SP) different with the shift mode P (SP) that discovers (in step S130, being defined as NO), ECU 300 execution in step S140 and S150 before execution in step S200 so.In step S130, be defined as under the situation of YES, just, if shift mode does not change, ECU 300 skips steps S140 and S150 so, execution in step S200.
In step S140, the shift mode P (SP) that ECU 300 will discover is rewritten as current shift mode C (SP), and prepares for execute exception next time detects control program.In step S150, the number of times FN that ECU 300 will be definite unusually increases by 1 from currency.When unusual definite number of times FN increased by this way, unusual definite number of times FN represented that activation signal SMJ remains on the quantity of the adjacent shift mode that experiences during the single SMJ break period of " OFF ".
In step S200, ECU 300 calculates the number EN in the zone of experience, and what area I-IV shift mode had passed through during number EN represented single SMJ break period.
With reference to figure 6, the step S200 among Fig. 4 is made up of step group S202-S209.
In step S202, ECU 300 determines whether current shift mode C (SP) is included in the area I, and whether flag F L1 is " OFF ".If be defined as YES in step S202, when promptly the first time was through area I during same SMJ break period, ECU 300 changed flag F L1 into " ON ", had passed through area I with expression, and in step S203 the number of regions EN that experiences was increased by 1.Because mark FL1 becomes " ON " in step S203, so current shift mode C (SP) is included under the situation in the area I once more during same SMJ break period, determining among the step S202 becomes NO, thereby do not increase the number EN in the zone of experience.
If step S202 is defined as NO, promptly during same SMJ break period for the first time through area I, ECU 300 execution in step S204.In step S204, ECU 300 determines whether current shift mode C (SP) is included among the area I I, and whether flag F L2 is " OFF ".If step S204 is defined as YES, promptly during same SMJ break period during for the first time through area I I, ECU 300 changes flag F L2 into " ON ", has passed through area I I with expression, and in step S205 the number of regions EN of experience is increased by 1.Because mark FL2 becomes " ON " in step S205, so shift mode C (SP) is included under the situation among the area I I once more during same SMJ break period, determining among the step S204 becomes NO, thereby do not increase the number of regions EN of experience.
For area I II, ECU 300 carries out similar step S206 and S207, carries out similar step S208 and S209 for area I V.Therefore, the number EN in the zone of the experience of calculating in step S200 is illustrated in shift mode during the SMJ break period and has experienced how many zones among area I-IV.
With reference to figure 4, ECU 300 is execution in step S220 after step S200 again.When step S120 be defined as NO the time, promptly when current shift mode C (SP) does not belong among the presumptive area I-IV any one, execution in step S220, and skips steps S130, S140, S150 and S200.
In step S220, ECU 300 determines whether the number of regions EN (S200) of experience and unusual definite number of times FN (step S150) are equal to or greater than predetermined determined value.The determined value Nj1 of the number of regions EN of experience is set at and can detects the variation of shift mode on shift pattern during a SMJ break period.
For example, according to the layout of gear contact shown in Fig. 2 and 3, when shift mode during the SMJ break period when SP2 (area I) becomes SP7 (area I I), confirm the open failure of gear contact 180.On the other hand, when shift mode when SP2 (area I) becomes SP5 (area I I), do not confirm the open failure of gear contact 180.
Therefore, for fear of the mistake of abnormality detection, determined value Nj1 is made as 3.That is to say, in gear position sensor abnormality detection control according to present embodiment, the fact that during same SMJ break period, surpasses an area I-IV based on activation signal owing to the experience that becomes through gear positions, detect the open failure of gear contact 180, therefore, consider the layout of gear contact, determined value Nj1 need be set at the value that can prevent the abnormality detection mistake.
Unusually the determined value Nj2 of definite number of times FN sets for and makes that execute exception detects after the wipe contact 50 of rotor 100 moves to a certain degree, to avoid wrong detection.For example, determined value Nj2 is set at 5 to 10 quantity, makes to carry out abnormality detection on movable scope 100# (Fig. 2) after wipe contact 50 moves around once.
If the number of regions EN of experience and unusual definite number of times FN are equal to or greater than determined value Nj1 and Nj2 (being defined as YES in step S220) respectively, in step S250, ECU 300 confirms the abnormality detection of gear contact 180 open failure so.The result who detects comes driver etc. by exporting for example unshowned control panel or DM to.
If at least one among the number of regions EN of experience and the unusual definite number of times FN do not reach corresponding determined value Nj1, Nj2 (in step S220, being defined as NO), gear position sensor abnormality detection program stops so, and does not have unusual detection.But, in this case, do not carry out the step S110 that removes determined value, thus number of regions EN (step S200) and unusual definite number of times FN (step S150) of accumulative total experience, become " ON " up to activation signal SMJ signal, promptly during same SMJ break period.
Therefore, in the gear position sensor abnormality detection control according to present embodiment, based on experience is above the fact of an area I-IV during same SMJ break period by the process gear positions, the open failure that can detect gear contact 180 is unusual.In addition, consider the layout of gear contact,, can avoid the mistake of abnormality detection by number of regions EN and the unusual definite number of times FN that suitably sets experience.
In diagram of circuit shown in Figure 4, step S120 is corresponding to " adjacent area determining unit " of the present invention, and step S200, S220 and S250 are corresponding to " abnormality detection unit " of the present invention.
Fig. 7 is the diagram of circuit that shows according to second example of the gear position sensor abnormality detection control program of the embodiment of the invention.
Compare with abnormality detection control program among Fig. 4, in abnormality detection control program shown in Figure 7, ECU 300 also comprises step S230, S240 and S245.In addition, number of abnormality detections is increased and is determined value, and it has calculated the number of abnormality detections of abnormality detection control program among Fig. 4.During system initialization and during execution in step S110, the number of times of abnormality detection is initialized to initial value (=0), the situation of other determined value as shown in Figure 4.The other parts of control program are identical with the other parts of abnormality detection control program among Fig. 4 among Fig. 7, therefore, no longer repeat to describe in detail.
In step S230, when abnormality detection control program among Fig. 4 detects when unusual (, when being defined as YES in step S220), ECU 300 increases by 1 with number of abnormality detections.In addition, in step S240, whether the number of abnormality detections of accumulative total is equal to or greater than predetermined determined value among the ECU 300 determining step S230.
If number of abnormality detections is equal to or greater than predetermined determined value (being defined as YES in step S240), so in the step S250 identical with Fig. 4, ECU 300 confirms the abnormality detection of gear contacts 180 open failure, and by outputing to for example unshowned control panel or diagnostic display unit with the result notification chaufeur that detects etc.
If number of abnormality detections does not reach predetermined determined value (being defined as NO in step S240), gear position sensor abnormality detection program stops so, does not confirm unusual detection.When being defined as NO in step S220, in step S245, ECU 300 initialization exception detect the determined value of number of times.Therefore, become up to activation signal SMJ " ON " during, promptly during same SMJ break period, the abnormality detection that the abnormality detection control program carries out shown in the execution graph 4 reaches pre-determined number up to number of abnormality detections repeatedly.
For above-mentioned abnormality detection control program, compare with the situation of the control program of abnormality detection shown in Fig. 4, can prevent the mistake of abnormality detection more reliably.
Fig. 8 is the diagram of circuit that shows according to the 3rd example of the gear position sensor abnormality detection control program of the embodiment of the invention.
With reference to figure 8, in step S300, ECU 300 determines whether to detect the edge of activation signal SMJ, i.e. from " OFF " to " ON " or the transformation from " ON " to " OFF ".
When detecting the edge of activation signal SMJ, (in step S300, be defined as YES), in step S310, ECU 300 determines whether current shift mode C (SP) belong among shift mode SP1, SP2, SP5-SP7, SP9-SP11, SP14 and the SP15 adjacent with activation signal SMJ edge any one.Here, the edge that detects activation signal SMJ means the target of abnormality detection among Fig. 4 or Fig. 7 neither the connection fault of gear contact 180, open failure that neither gear contact 180.
If shift mode C (SP) does not belong to any one (being defined as NO in step S310) in these shift modes, the combination of activation signal is the activation signal combination that can not exist basically when detecting the edge of activation signal SMJ so.Therefore, in step S250, ECU 300 detects the unusual of gear contact 110-170.
If shift mode C (SP) belongs to one of these shift modes (being defined as YES in step S310), gear contact 110-170 does not occur unusual so.Therefore, in the step S110 identical with Fig. 4, ECU 300 initialization determined values, and stop the abnormality detection program.
When in step S300, being defined as NO, ECU 300 carry out with Fig. 4 in identical step S200, wherein, ECU 300 calculates the experience number of regions EN that (comprising a SMJ break period) shift mode during the expression indeclinable cycles of activation signal SMJ experiences several area I-IV.
In addition, in step S320, ECU 300 compares experience number of regions EN and the determined value Nj1 that calculates among the step S200.If experience number of regions EN be equal to or greater than with the step S220 of Fig. 4 in the determined value Nj1 (in step S320, being defined as YES) that sets of similar mode, in step S250, ECU 300 detects the unusual of gear contacts 180 so.By outputing to for example unshowned control panel or diagnostic display unit, will if necessary, be notified to chaufeur etc. in the abnormality detection result among the step S250 with the information of explanation gear contact et out of order.
If experience number of regions EN does not reach determined value Nj1 (being defined as NO in step S320), ECU 300 stops the abnormality detection program so, does not detect unusual.But, in this case, owing to do not carry out the step S110 that removes (initialization) determined value, so accumulative total experiences the counting of number of regions EN, up to the edge that detects activation signal SMJ.According to above-mentioned steps S200 and S320, can as the situation among Fig. 4, detect unusual (open failure) of gear contact 180.
In addition, although it is not shown in flow process, but when in step S300, being defined as NO, determine by carrying out whether current shift mode C (SP) belongs to corresponding to activation signal SMJ shift mode SP1, the SP6 in normal " ON " cycle, any one comparison among SP10, the SP15-SP17, can detect the gear contact 180 that activation signal SMJ is fixed as " ON " and connect faults.That is to say, in order to detect the connection fault and the open failure of gear contact 180, this control can be configured such that whether about activation signal SMJ be the determining based on NO among the step S300 of determining of " ON " or " OFF ", then when activation signal SMJ is " OFF ", carry out above-mentioned steps S200 and S320, and when activation signal SMJ is " ON ", carry out above-mentioned comparison process (comparison between C (SP) and shift mode SP1, SP6, SP10, the SP15-SP17).
As mentioned above, in the control program of the gear position sensor abnormality detection shown in Fig. 8, can carry out the abnormality detection of gear contact 110-170 and gear contact 180.Especially, because relatively normal activation signal pattern can be constrained to some shift mode in step S310, become and to carry out with the service load of the minimizing of the storage area of the minimizing of the shift mode that will compare and comparison process so detect the fault of each gear contact.Therefore, can obtain effective structure of abnormality detection.
In another abnormality detection structure that is 180 settings of gear contact, can be from deletion step S200 of the gear position sensor abnormality detection control program shown in Fig. 8 and S320, to realize carrying out the structure that only be used for gear contact 110-170 abnormality detection.
In diagram of circuit shown in Figure 8, step S300 is corresponding to " transition detection unit " of the present invention, step S310 is corresponding to " regional determining unit " of the present invention, processing from step S310 to step S250 is corresponding to " the first abnormality detection unit " of the present invention, from the processing of step S200, S320 to S250 corresponding to " the second abnormality detection unit " of the present invention.
In the present embodiment, by case description have P shelves, R shelves, N shelves, D shelves and B shelves a abnormal detector as the gear position sensor of optional gear.But application of the present invention is not limited to this situation.Gear abnormal detector according to the present invention is applicable to any gear of the gear contact that has three or more optional gear and be provided with corresponding to these gears in a similar manner.
Should be appreciated that embodiment disclosed herein is schematically, rather than limit by any way.Scope of the present invention is defined by the claims, rather than top description and example, the invention is intended to comprise all modifications and the variation that belong in the scope that is equivalent to claim and the implication.
Industrial applicibility
Gear position sensor abnormal detector according to the present invention is applicable to and comprises automatic transmission Vehicle.

Claims (4)

1. the abnormal detector of a gear position sensor, this gear position sensor has at least three gears, selects to operate movably wipe contact (50) and the predetermined activation signal (SP of output when contacting with described wipe contact according to the gear of chaufeur, SR, SN, SD, SB, SRV, SFD, a plurality of gears contact (110-180) SMJ)
Described wipe contact has movable scope, and described movable scope comprises a plurality of gear positions that correspond respectively to described gear and the transitional region between every adjacent two gear positions in described gear positions;
Described a plurality of gears contact comprises a plurality of first gear contacts (110-170) and one second gear contact (180), and each all is arranged to comprise the part of the described transitional region of single described gear positions and its both sides described a plurality of first gear contacts; The described second gear contact is arranged to corresponding to each described gear positions, and at least some in described a plurality of first gear contacts are located such that the position of adjacent two the first gear contacts in the described first gear contact preset range that overlaps each other;
Described gear position sensor is configured to when described activation signal during from the output of the described second gear contact, based on the described gear of selecting from the combine detection of the described activation signal of described a plurality of first gear contacts output;
Described abnormal detector comprises:
Adjacent area determining unit (S120), a plurality of predetermined adjacent regions (SP2 that it determines whether combination from the described activation signal of each in the described first and second gear contacts belongs in a plurality of zones (SP1-SP17) that limit corresponding to the combination of described activation signal, set corresponding to each described a plurality of gear positions, SP5, SP7, SP9, SP11, SP14) any predetermined adjacent regions in; And
Abnormality detection unit (S200, S220, S250), the described activation signal of the described second gear contact remain on non-output state during, by the described gear positions of process, when described activation signal had become the two or more different predetermined adjacent regions of experience in the described predetermined adjacent regions, this abnormality detection unit detected the fault of the described second gear contact.
2. the abnormal detector of gear position sensor as claimed in claim 1 wherein when repeatedly duplicate detection is to the fault of the described second gear contact by described abnormality detection unit, is confirmed the fault of the described second gear contact.
3. the abnormal detector of a gear position sensor, this gear position sensor has at least three gears, selects to operate movably wipe contact (50) and the predetermined activation signal (SP of output when contacting with described wipe contact according to the gear of chaufeur, SR, SN, SD, SB, SRV, SFD, a plurality of gears contact (110-180) SMJ)
Described wipe contact has movable scope, and described movable scope comprises a plurality of gear positions that correspond respectively to described gear and the transitional region between every adjacent two gear positions in described gear positions;
Described a plurality of gears contact comprises a plurality of first gear contacts (110-170) and one second gear contact (180), and each all is arranged to comprise the part of the described transitional region of single described gear positions and its both sides described a plurality of first gear contacts; The described second gear contact is arranged to corresponding to each described gear positions, and described a plurality of first gear contacts are located such that the position of adjacent two the first gear contacts in the described first gear contact preset range that overlaps each other;
Described gear position sensor is configured to when described activation signal during from the output of the described second gear contact, based on the described gear of selecting from the combine detection of the described activation signal of described a plurality of first gear contacts output;
Described abnormal detector comprises:
Transition detection unit (S300), it detects extremely first transition and second transition from described non-output state to described output state of non-output state of output state from the described activation signal of the described second gear contact;
Zone determining unit (S310), when described transition detection unit detects described first or second transition, described regional determining unit determines whether the combination of the described activation signal of each in the described first and second gear contacts belongs in a plurality of zones (SP1-SP17) that limit corresponding to the combination of described activation signal, with the adjacent presumptive area (SP1 of point of transition of the activation signal of the described second gear contact, SP2, SP5-SP7, SP9-SP11, SP14, SP15); And
The first abnormality detection unit (S250), when described regional determining unit determined that the described combination of described activation signal does not belong to described presumptive area, this first abnormality detection unit detected the fault of the described first gear contact.
4. the abnormal detector of gear position sensor as claimed in claim 3, the described a plurality of zones (SP1-SP17) that wherein limit corresponding to the combination of described activation signal comprise a plurality of predetermined adjacent regions (SP2 that set corresponding to each described a plurality of gear positions, SP5, SP7, SP9, SP11, SP14)
Described abnormal detector also comprises:
The second abnormality detection unit (S320), described transition detection unit both detected also detect less than described second transition less than described first transition during, by the described gear positions of process, when described activation signal had become the two or more different predetermined adjacent regions of experience in the described predetermined adjacent regions, this second abnormality detection unit detected the fault of the described second gear contact.
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